Extra Class License Exam Questions

Subelement E6

Circuit Components

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Group E6A Semiconductor materials and devices: semiconductor materials; germanium, silicon, P-type, N-type; transistor types: NPN, PNP, junction, field-effect transistors: enhancement mode; depletion mode; MOS; CMOS; N-channel; P-channel
E6A01 In what application is gallium arsenide used as a semiconductor material in preference to germanium or silicon?
E6A02 Which of the following semiconductor materials contains excess free electrons?
E6A03 Why does a PN-junction diode not conduct current when reverse biased?
E6A04 What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
E6A05 What is the alpha of a bipolar junction transistor?
E6A06 What is the beta of a bipolar junction transistor?
E6A07 Which of the following indicates that a silicon NPN junction transistor is biased on?
E6A08 What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
E6A09 What is a depletion-mode FET?
E6A10 In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?
E6A11 In Figure E6-2, what is the schematic symbol for a P-channel junction FET?
E6A12 Why do many MOSFET devices have internally connected Zener diodes on the gates?
E6A13 What do the initials CMOS stand for?
E6A14 How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?
E6A15 Which semiconductor material contains excess holes in the outer shell of electrons?
E6A16 What are the majority charge carriers in N-type semiconductor material?
E6A17 What are the names of the three terminals of a field-effect transistor?
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Group E6B Diodes
E6B01 What is the most useful characteristic of a Zener diode?
E6B02 What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?
E6B03 What special type of diode is capable of both amplification and oscillation?
E6B04 What type of semiconductor device is designed for use as a voltage-controlled capacitor?
E6B05 What characteristic of a PIN diode makes it useful as an RF switch or attenuator?
E6B06 Which of the following is a common use of a hot-carrier diode?
E6B07 What is the failure mechanism when a junction diode fails due to excessive current?
E6B08 Which of the following describes a type of semiconductor diode?
E6B09 What is a common use for point contact diodes?
E6B10 In Figure E6-3, what is the schematic symbol for a light-emitting diode?
E6B11 What is used to control the attenuation of RF signals by a PIN diode?
E6B12 What is one common use for PIN diodes?
E6B13 What type of bias is required for an LED to emit light?
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Group E6C Digital ICs: Families of digital ICs; gates; Programmable Logic Devices (PLDs)
E6C01 What is the function of hysteresis in a comparator?
E6C02 What happens when the level of a comparator’s input signal crosses the threshold?
E6C03 What is tri-state logic?
E6C04 What is the primary advantage of tri-state logic?
E6C05 What is an advantage of CMOS logic devices over TTL devices?
E6C06 Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
E6C07 What best describes a pull-up or pull-down resistor?
E6C08 In Figure E6-5, what is the schematic symbol for a NAND gate?
E6C09 What is a Programmable Logic Device (PLD)?
E6C10 In Figure E6-5, what is the schematic symbol for a NOR gate?
E6C11 In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?
E6C12 What is BiCMOS logic?
E6C13 Which of the following is an advantage of BiCMOS logic?
E6C14 What is the primary advantage of using a Programmable Gate Array (PGA) in a logic circuit?
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Group E6D Toroidal and Solenoidal Inductors: permeability, core material, selecting, winding; transformers; Piezoelectric devices
E6D01 How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?
E6D02 What is the equivalent circuit of a quartz crystal?
E6D03 Which of the following is an aspect of the piezoelectric effect?
E6D04 Which materials are commonly used as a slug core in a variable inductor?
E6D05 What is one reason for using ferrite cores rather than powdered-iron in an inductor?
E6D06 What core material property determines the inductance of a toroidal inductor?
E6D07 What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?
E6D08 What is one reason for using powdered-iron cores rather than ferrite cores in an inductor?
E6D09 What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?
E6D10 What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?
E6D11 How many turns will be required to produce a 1-mH inductor using a core that has an inductance index (A L) value of 523 millihenrys/1000 turns?
E6D12 What is the definition of saturation in a ferrite core inductor?
E6D13 What is the primary cause of inductor self-resonance?
E6D14 Which type of slug material decreases inductance when inserted into a coil?
E6D15 What is current in the primary winding of a transformer called if no load is attached to the secondary?
E6D16 What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?
E6D17 Why should core saturation of a conventional impedance matching transformer be avoided?
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Group E6E Analog ICs: MMICs, CCDs, Device packages
E6E01 Which of the following is true of a charge-coupled device (CCD)?
E6E02 Which of the following device packages is a through-hole type?
E6E03 Which of the following materials is likely to provide the highest frequency of operation when used in MMICs?
E6E04 Which is the most common input and output impedance of circuits that use MMICs?
E6E05 Which of the following noise figure values is typical of a low-noise UHF preamplifier?
E6E06 What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?
E6E07 Which of the following is typically used to construct a MMIC-based microwave amplifier?
E6E08 How is voltage from a power supply normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?
E6E09 Which of the following component package types would be most suitable for use at frequencies above the HF range?
E6E10 What is the packaging technique in which leadless components are soldered directly to circuit boards?
E6E11 What is a characteristic of DIP packaging used for integrated circuits?
E6E12 Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?
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Group E6F Optical components: photoconductive principles and effects, photovoltaic systems, optical couplers, optical sensors, and optoisolators; LCDs
E6F01 What is photoconductivity?
E6F02 What happens to the conductivity of a photoconductive material when light shines on it?
E6F03 What is the most common configuration of an optoisolator or optocoupler?
E6F04 What is the photovoltaic effect?
E6F05 Which describes an optical shaft encoder?
E6F06 Which of these materials is affected the most by photoconductivity?
E6F07 What is a solid state relay?
E6F08 Why are optoisolators often used in conjunction with solid state circuits when switching 120VAC?
E6F09 What is the efficiency of a photovoltaic cell?
E6F10 What is the most common type of photovoltaic cell used for electrical power generation?
E6F11 What is the approximate open-circuit voltage produced by a fully-illuminated silicon photovoltaic cell?
E6F12 What absorbs the energy from light falling on a photovoltaic cell?
E6F13 What is a liquid crystal display (LCD)?
E6F14 Which of the following is true of LCD displays?
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